Improvement in self-closing hatchways



A. Monnlsun. l Self-IIIwingHatchways;V

Parle-mum 6,1374.

Ulvrrnn STATES PATENT @einen vVILLIAM A. MORRISON, OF CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN SELF-CLOSING HATCHWAVS.

Specification forming part of Letters Patent No. 146,141, dated January G, 1874; application filed i June 12, 1873.

To all whom it may concern:

Be it known that 1, WILLIAM A. MORRL SON, of Cambridge, of the county of vMiddlen seX and State of Massachusetts, have invented a new and useful Improvement in Elevators for Buildings; and do hereby declare the same to be fully described in the following specii-` cation and represented in the accompanying drawings, of which- Figure l is a top view, Fig. 2 a front elevation, Fig. 3 a longitudinal section, and Fig. 4 a

"transverse section, of one of my improved elevators.

There is to be to each floor A, through which the elevator-car B is to pass, or the tended from its `top two cammed rods, D l),

and from its bottom two cams, E E, all as shown. It also has two curved safety-guides, F F, arranged on and projected from its top, in manner as represented. If we suppose G to be the iioor ot' the cellar or basement, beyond which the car is not to descend, the first and each floor over such ot' the building' is to be provided, as mentioned, with a hatchway for the car to pass through, such hatchway being shown at H, and as furnished with two hat-ches or doors, I I, hinged or pivoted to its opposite ends. From the outer'end of each hatch two arms, K L, extend, one of which, viz., K, has suspended from it an overbalance-weight, M, such as will raise the hatch from` a vertical or inclined position to a hori zontal-one, and against two stopfplatcs or thresholds, N N, arranged on opposite sides of the hatchway and on the iioor, in manner as represented, and fastened to the iioor. Each of the other arms L is pivoted to the upper end of one of two slotted bars, O O, arranged `as shown. Through the slot f of each bar O a headed stud, g, projects from the next adjacent guide-post. Furthermore, in the door, and close to where the inner edges of the doors or hatches come together, there are two slide bolts, P l), to pass underneath both doors, and hold them in horizontal positions, each bolt being furnished with a spring, Q, to force it inward. The cammed` rods D D and the cams E E are for the purpose of forcing backward such bolts, in order to allow of the hatches or doors being moved downward.

While the car may be ascending t0 the (1001,87 ...,i

the cams or inclined parts h h of the cammed rods will be s, moved between `the doors or hatches and against the inner ends of the bolts, and will force the bolts back from underneath the doors. As soon as the top of the.V car may have arisen again st the lower ends of the slotted bars O O it will commence to force such bars upward, in consequence of `which the hatches will be causedto turn downward, and the bars be moved upward and laterally until the hatches may have been moved into vertical positions, t-he safety-guides F F operating also to guide or force the doors downward, and prevent them from catching upon the top of the car, so as to be an obstacle or obstacles to its movement. The car, continuing to rise, will pass the doors and up through the hatchway, the slotted bars during the asscent ofthe car having slipped oii' it. On the bottom of thecar rising above the hatchway, the doors will be closed by the gravitating` power of their overbalanceweights, and im mediately after the cams E, E may have passed above the bolts, such bolts will be` shot forward by their springs, and will hold the hatches or doors in position. During a de scent of the car, the cams E E will rst be forced against the bolts, and will press them back from underneath the hatches, which, as the car may continue to descend, will be moved downward by it until it may have passed by them. This having taken place, the doors will be raised up by their overbalanceweights, such doors, while going up, moving against and being eased upward by the safety-guides.

I claim as my invention the following, viz:

l. The bolt or bolts P and actuatingsprings Q, applied to the oor, in combination with the cmu E and cmulned rod D, applied to the oar, all boing arranged with the C21-r and hatch- Way, and to operate as set forth.

2. The overbalanoe-Woghts M M and arms K K L L, the slotted rod or rods O, the bolt or bolts P, the spring or springs Q, the C21-ms E E,m1d the cammed rods D D, arranged and combined with the oar B, the hatches 1 and thehatohway H, all substantially in mar,- ner and to opera-to as speoied.

`WVM. A. MORRISON. Witnesses:

R. H. EDDY, J. R. SNOW. 

